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The SPS and RPS can connect to auxiliary power appliances via the dedicated auxiliary power tap
(TB3). If more power is needed, any of the three NAC outputs can be used for auxiliary power.
All wiring must be between 18 AWG (0.8231 mm
2
) and 12 AWG (3.309 mm
2
).
All wiring is power-limited.
Auxiliary power may be taken from the dedicated auxiliary power tap or from an unused NAC.
Total available auxiliary power current is 1A for regulated 24 VDC NAC applications, 5A
otherwise. AUX power is rated up to 2 A per circuit. The total current available is 5A for
regulated 24 VDC, 9A otherwise, including NAC, auxiliary, and card power.
Remove end-of-line resistors from circuits that are used for auxiliary power.
External wiring is not supervised unless an end-of-line relay is wired coil to auxiliary power,
and Normally Open contacts are monitored by a system power point. Relay current must be
considered as part of the load.
All wiring that leaves the building requires overvoltage protection. Install module
2081-9044 (3 A) or 2081-9028 (1/4 A) inside a UL-Listed electrical box wherever wire
enters or exits the building. A maximum of four 2081-9044 Modules may be connected to
one channel. When using the 2081-9044, the maximum alarm current is reduced to
1/4 A for that part of the circuit downstream of the module. Refer to 574-805 for
installation instructions of 2081-9028 modules or to 574-832 for installation instructions of
2081-9044 modules
The nominal voltage rating is 24 VDC, 2 V p-p ripple (maximum).
The following devices connect to 2 A aux power:
2088-Series relays and door holders
2098-Series four-wire smoke detectors
2190-Series monitor and signal ZAMs
4090-Series IDNet ZAMs
4098-Series four-wire smoke detectors and duct detectors
2190-9039 Printer
4190-9050/9051 4-20 mA ZAMs
4603-9101 LCD Annunciator
When powering remote units or switching power through relay contacts, power for these
circuits must be provided by a UPS-style power supply, the 4100-1108 Power Supply
(8 A), or a power-limited power supply that listed for fire-protective signaling use.
Continued on next page
Auxiliary Power Wiring
Guidelines
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